Shield for tunnels.



PATENTED OCT. 30, 1906.

H.JAPP. SHIELD :EUR TUNNQLS.l APPLICATION FILED APB. 12, 1908-.

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.HENRY JAPP, OE NEW YORK` N. Y.Ass1eNoR ro s. PEARSON a SON, j INCORPORATED, OE LONG ISLAND OITY, NEW YORK, A CORPORA- TION 'OF NEW YORK,

' SHIELD FoR'TUNNELs.

Specification of Letters Patent.

I Patented Oct. 30, 1906.

lApplication filed April 12. 1906. Serial No. 311,312.

To all' whom it may concern,.- Y

Be it known that I, HENRY JAPP, a subject of the King of Great Britain and Ireland, residing in the borough of Manhattan, .in the city, county, and State of New York, haveinvented certain new and useful Improvements in Shields for Tunnels, of which the following' is a specification.

My invention relates to shields used in tunnel-driving, and particularly to an improved extension-hood around the shield and the means for advancing it.

The object of my invention is to produce a more simple and more efficient extensionhood than those now in use whereby the hood may be more easily and quickly advanced either as a whole or in parts.

In the accom anying drawings, Figure -1 shows a longitu inal section ofthe shield and one of the parts of the hood with its advancing means. Fig. 2 is a sectional view taken on the line 2 2, Fig. 1. Fig. 3 is a view, partly in end elevation and partly in section7 on the line 3 3,Fig. 1.

In the drawings, 5 represents one of the segments of any suitable style for lining the interior ofthe shield, only one-half of which is shown in Fig. 2. This shield, as is well known in the art,.is placed in advance and pushed forward as aV whole in the usual manner. These se ments 5 form a part of the shield, and in ront of them is another ring of segments 6, of slightly-different form. These segmental rings are secured to each other and to the shell of the shield in any suitable manner.

Around the outside ofthe upper half of the shield are longitudinally-adjustable plates 7, which constitute the extension-hood. These plates project slightly beyond the front of the shield and may have one or more reinforcin cutting-edge plates 8 secured thereto. Bolted or otherwise attached to these plates 7 8 is a T-piece 9, which may be conveniently made of angle-irons, Fig. 3. To each T-piece I bolt or otherwise secure the outer end of a tubular trod 10, which projects backward within the forward end of the shield and is supported and can slide in the Guide 11, bolted to the segment 6. This tubular rod 10, acting asa cylinder, works in conjunction with the hollow rod 12, which is secured to the rear'ilange of the'segment 5 and acts as a stationary piston. lThe sliding tubular rod or cylinder 10 is guided in 55 the flange of the segment 6 and in the forward flange of segment 5, as well as in the guide 11, close to the front of the shield. This uide 1 1 is primarily relied on to support the Iates 7 8. l 6o T e hollow piston 12 may be secured to the se ment 5 by a bushing 13 inthe inner wall OI the segment 5. A stuiiing-box 14 is provided at the end ofthe cylinder 10 around the piston 12. j

Hydraulic or other fluid pressure is ad mitted through the hollow piston at the rear end 15 from any convenient source of supply. Suitable valves or cocks are provided to provide for the advance of either an individual .7o plate or any number desired simultanously or successively.

It is now clearly seen that on admitting luidressure to any cylinder 10 at 15 the cylin er will be forced out to advance the lates 7 8 any desired distance within the limits of movement ofthe cylinder.

I claim as my invention- 1. In combination with a tunnel-shield, an extensible hood comprising a lurality of 8o sliding plates around the perip ery of the shield, and {luid-pressure means for operating each late independently.

2. n combination with a tunnel-shield, an extensible hood comprising a lurality of sliding'plates around the peri liery of the shield, and a hydraulic piston or operating each plate independently.

p 3. In combination with a tunnel-shield, an

extensible vhood comprising a plurality of 9o sliding plates, a reinforced cutting edge for each of said plates, a hydraulic piston for operating each plate, and means connected with the shield for supporting and guiding' the piston. l9 5 4. In combination with a tunnel-shield, an extensible hood, comprisin a plurality of sliding plates, a cylinder an piston for each plate, one of these parts being secured to the plate and the other to the shield, and guiding roo eXtensible hood comprising a plurality of sliding plates around the perip ery of the shield, With a cylinder secured to each plate7 and a hollow piston therefor secured to the shield.

6. In combination With a tunnel-shield, an extensible hood, comprising a plurality of sliding plates, With a cylinder and piston7 one secured to each plate and the other to the shield and a guide for the moving part 1o bolted to the shield.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

HENRY JAPP.

Witnesses:

EVELYN F. HoUGH'roN,

L. I. LEVI. 

